Condensed Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Operating Activities:
Net income	$ 23,847	$ 14,203
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	5,059	4,592
Amortization	536	835
Gain on sale of discontinued operations, net of tax	(8,563)
Stock-based compensation	2,001	2,223
Bad debt recovery	(60)	(380)
Deferred income taxes (benefit)	(2,823)	39
Gain on amended supply agreement	(507)
Cash received from amended supply agreement	10,000
Changes in operating assets and liabilities:
Accounts receivable, net	(10,472)	11,303
Costs and billings in excess of estimates on uncompleted contracts	(4,840)	35,515
Inventories	(495)	498
Prepaid expenses and other current assets	959	(1,778)
Accounts payable and income taxes payable	(10,407)	302
Accrued liabilities	(11,307)	(10,172)
Other, net	294	(4)
Net cash provided by (used in) operating activities	(6,778)	57,176
Investing Activities:
Proceeds from sale of property, plant and equipment	60	639
Proceeds from sale of Transdyn	14,819	0
Purchases of property, plant and equipment	(8,464)	(33,270)
Net cash provided by (used in) investing activities	6,415	(32,631)
Financing Activities:
Payments on industrial development revenue bonds	(400)	(400)
Taxes on stock-based compensation	(499)
Dividends paid	(5,992)
Payments on short-term and other financing	(16)	(298)
Net cash used in financing activities	(6,907)	(698)
Net increase (decrease) in cash and cash equivalents	(7,270)	23,847
Effect of exchange rate changes on cash and cash equivalents	1,252	175
Cash and cash equivalents, beginning of period	107,411	90,040
Cash and cash equivalents, end of period	$ 101,393	$ 114,062